Henin using a light racket

Can anybody explain why Henin is using a hyper hammer 5.3 stretch(H-tour = paint job)
I know this racket weighs about 284 g(strung) and is only 3 points head heavy.
I've heard they didn't customize her racket except for the powerholes.
I thought these lightweights were not suited for the real good players??
Is she the only player who uses a lighweight??